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Mathematics
Mathematics
Problem
The number of three digit numbers of the form
x
y
z
xyz
x
y
z
such that
x
<
y
x < y
x
<
y
and
z
≤
y
z \leq y
z
≤
y
is : (a) 156 (b) 204 (c) 240 (d) 276
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